76 lines
2 KiB
Nix
76 lines
2 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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crashdump = config.boot.crashDump;
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kernelParams = concatStringsSep " " crashdump.kernelParams;
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in
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###### interface
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{
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options = {
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boot = {
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crashDump = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If enabled, NixOS will set up a kernel that will
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boot on crash, and leave the user in systemd rescue
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to be able to save the crashed kernel dump at
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/proc/vmcore.
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It also activates the NMI watchdog.
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'';
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};
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reservedMemory = mkOption {
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default = "128M";
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type = types.str;
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description = ''
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The amount of memory reserved for the crashdump kernel.
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If you choose a too high value, dmesg will mention
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"crashkernel reservation failed".
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'';
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};
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kernelParams = mkOption {
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type = types.listOf types.str;
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default = [ "1" "boot.shell_on_fail" ];
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description = ''
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Parameters that will be passed to the kernel kexec-ed on crash.
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'';
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};
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};
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};
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};
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###### implementation
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config = mkIf crashdump.enable {
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boot = {
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postBootCommands = ''
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echo "loading crashdump kernel...";
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${pkgs.kexec-tools}/sbin/kexec -p /run/current-system/kernel \
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--initrd=/run/current-system/initrd \
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--reset-vga --console-vga \
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--command-line="init=$(readlink -f /run/current-system/init) irqpoll maxcpus=1 reset_devices ${kernelParams}"
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'';
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kernelParams = [
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"crashkernel=${crashdump.reservedMemory}"
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"nmi_watchdog=panic"
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"softlockup_panic=1"
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];
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kernelPatches = [ {
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name = "crashdump-config";
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patch = null;
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extraConfig = ''
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CRASH_DUMP y
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DEBUG_INFO y
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PROC_VMCORE y
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LOCKUP_DETECTOR y
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HARDLOCKUP_DETECTOR y
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'';
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} ];
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};
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};
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}
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